Extra plasticity governed by shear band deflection in gradient metallic glasses

Yao Tang, Haofei Zhou (), Haiming Lu, Xiaodong Wang, Qingping Cao, Dongxian Zhang, Wei Yang and Jian-Zhong Jiang ()
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Yao Tang: Zhejiang University
Haofei Zhou: Zhejiang University
Haiming Lu: Zhejiang University
Xiaodong Wang: Zhejiang University
Qingping Cao: Zhejiang University
Dongxian Zhang: Zhejiang University
Wei Yang: Zhejiang University
Jian-Zhong Jiang: Zhejiang University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Inspired by gradient materials in nature, advanced engineering components with controlled structural gradients have attracted substantial research interests due to their exceptional combinations of properties. However, it remains challenging to generate structural gradients that penetrate through bulk materials, which is essential for achieving enhanced mechanical properties in metallic materials. Here, we report practical strategies to design controllable structural gradients in bulk metallic glasses (BMGs). By adjusting processing conditions, including holding time and/or controlling temperatures, of cryogenic thermal cycling and fast cooling, two different types of gradient metallic glasses (GMGs) with spatially gradient-distributed free volume contents can be synthesized. Both mechanical testing and atomistic simulations demonstrate that the spatial gradient can endow GMGs with extra plasticity. Such an enhanced mechanical property is governed by the gradient-induced deflection of shear deformation that fundamentally suppresses the unlimited shear localization on a straight plane that would be expected in BMGs without such a gradient.

Date: 2022
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DOI: 10.1038/s41467-022-29821-4

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